The only daughter of the wealthy Kunou family. Called "twisted" even by her own brother (not exactly a paragon of normalcy himself), she often engages in erratic behaviour, including (but not limited to) ambushing rival students before gymnastics competitions, leaping around town in a leotard randomly paralysing/poisoning people, and attempting to feed her brother to her pet crocodile Midorigame.
Kodachi is a superhumanly powerful martial artist in her chosen field of Martial Arts Rhythmic Gymnastics, comparable to but probably less powerful than Ukyou. She is also quite skilled at brewing and using a variety of ingested, inhaled or contact poisons.